Role of N-Glycosylation in FcγRIIIa interaction with IgG.

Role of N-Glycosylation in FcγRIIIa interaction with IgG.
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DOI:
10.3389/fimmu.2022.987151
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发表时间:
2022
影响因子:
7.3
通讯作者:
Clausen, Henrik
Clausen, Henrik
中科院分区:
医学2区
文献类型:
--
作者:
Van Coillie, Julie;Schulz, Morten A.;Bentlage, Arthur E. H.;de Haan, Noortje;Ye, Zilu;Geerdes, Dionne M.;van Esch, Wim J. E.;Hafkenscheid, Lise;Miller, Rebecca L.;Narimatsu, Yoshiki;Vakhrushev, Sergey Y.;Yang, Zhang;Vidarsson, Gestur;Clausen, Henrik

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免疫球蛋白 G (IgG) 及其 Fc γ 受体 (FcγR) 在我们的免疫系统中发挥着重要作用。 IgG1 Fc 区中的保守 N-聚糖会影响 IgG 与 FcγR 的相互作用以及由此产生的效应子功能,从而设计出大大改善抗体依赖性细胞毒性 (ADCC) 活性的抗体疗法。研究表明,FcγRIII 的 N-糖基化也会影响受体与 IgG 的相互作用,但 N-糖基化的天然异质性阻碍了对 IgG1 和 FcγRIIIa 与不同 N-聚糖相互作用的详细研究。在本研究中,我们利用哺乳动物细胞系中 N-糖基化能力的综合基因工程来表达具有不同 N-聚糖结构的 IgG1 和 FcγRIIIa,以更广泛地探索 N-糖基化在 IgG1:FcγRIIIa 结合相互作用中的作用。我们纳入了 158F 和 158V 同种异型的 FcγRIIIa 变体,并研究了影响结合亲和力的关键 N-聚糖特征。我们的研究证实,无岩藻糖基化 IgG1 与寡甘露糖 FcγRIIIa 具有最高的结合亲和力,寡甘露糖 FcγRIIIa 是一种聚糖结构,常见于 NK 细胞表达的 FcγRIIIa 上的 Asn162 上,但单核细胞或重组表达的 FcγRIIIa 上不存在。
Immunoglobulins G (IgG) and their Fc gamma receptors (FcγRs) play important roles in our immune system. The conserved N-glycan in the Fc region of IgG1 impacts interaction of IgG with FcγRs and the resulting effector functions, which has led to the design of antibody therapeutics with greatly improved antibody-dependent cell cytotoxicity (ADCC) activities. Studies have suggested that also N-glycosylation of the FcγRIII affects receptor interactions with IgG, but detailed studies of the interaction of IgG1 and FcγRIIIa with distinct N-glycans have been hindered by the natural heterogeneity in N-glycosylation. In this study, we employed comprehensive genetic engineering of the N-glycosylation capacities in mammalian cell lines to express IgG1 and FcγRIIIa with different N-glycan structures to more generally explore the role of N-glycosylation in IgG1:FcγRIIIa binding interactions. We included FcγRIIIa variants of both the 158F and 158V allotypes and investigated the key N-glycan features that affected binding affinity. Our study confirms that afucosylated IgG1 has the highest binding affinity to oligomannose FcγRIIIa, a glycan structure commonly found on Asn162 on FcγRIIIa expressed by NK cells but not monocytes or recombinantly expressed FcγRIIIa.
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